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Without thermal probe to compare temps of inside vs outside of tires most often i keep stock pressure, and letting out excess from tracked hot tires to revert to that. Exception being when i used tire pressures aswell to change grip front-rear bias back then during very first trackdays when i still had stock alignment (imho too understeer-ish and certainly of not enough static negative camber for track). Then i lowered pressure in fronts even more, to add grip there. Cheap tire pressure gauges are .. well, cheap, and at most fuel station stores. If you haven't one, buy one and let out excess from overheated tires as you track. Remember to pump back after end of trackday though.

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